£ells] notes on rock-contacts IN KINGSTON DISTRICT 103 



some of the strata of the sandstone show much false bedding. This 

 locality is locally known as Gildersleeve's quarry. 



These Potsdam strata rest upon the eroded surface of granite 

 and gneiss with which are occasional hands of crystalline limestone. 

 They have a thickness of not far from 60 feet, and lie in a nearly 

 horizontal position, except where inclined, owing to conditions of 

 deposition on an irregular floor. They do not show any sign of fault- 

 ing, and are capped directly a short distance inland by Black Eiver 

 limestone with thin shales at the base. The limestones are precisely 

 similar to those seen at Kingston and Barriefield hill, and the whole 

 series, including the sandstones which thin out at the eastern limit 

 to a few inches only, rest in a basin on the Archaean rocks. No fos- 

 sils are found in the sandy beds, with the exception of Scolithus mark- 

 ings, but there are a number of concretions, the most important of 

 which assume the form of long cylindrical tree trunks which stand 

 upright in the sandstone and have a length of thirty to forty feet, 

 with a diameter of three to four feet. Around the base of the 

 quarry are also a number of rounded, generally small concretions which 

 by the quarry men have been regarded as representing the fruit from 

 the supposed fossil trees. These smaller concretions are found at 

 several other localities where the similar sandstones are developed, 

 as about Knowlton lake. 



Further north the sandstone beds occur at a number of isolated 

 points as at Jones' Falls and axound the shores of several of the lakes 

 along the canal route, but the overlying sandstone formation is not 

 seen nor any trace of the Calciferous till we reach the outcrops at 

 West Eideau lake already referred to. 



To the west of the Eideau canal similar deposits of sandstone 

 are to be seen at several places, in the area north of Kingston. Around 

 the shores of Dog lake they form cliffs and have a thickness of 75 

 to 100 feet, with interstratified irregular bands of conglomerate. The 

 rock is both red and gray and the formation contains pockety deposits 

 of red haematite, some of which are sutticiently large to mine locally. 



Among the most interesting of these contacts are several seen 

 around the south side of Loughborough lake near the village of Bat- 

 tersea. Very full descriptions of the rocks of this locality have been 

 given by Mr. A. Murray in the Eeport for 1852-53, now long out 

 of print 



The sandstones are seen both along the south side of the lake at 

 this place as well as along the road thence to Dog lake. About the 

 village of Battersea, which is underlaid by massive red granite for the 

 most part, the sandstone, both red, white or gray, forms irregular shaped 

 areas resting on the granite, and on the lake shore it is seen in 



